﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace Apewer.Web
{

    internal sealed class MiniStreamAsyncResult : IAsyncResult
    {

        object locker = new object();
        ManualResetEvent handle;
        bool completed;

        internal byte[] Buffer = null;
        internal int Offset = 0;
        internal int Count = 0;
        internal AsyncCallback Callback = null;
        internal object State = null;
        internal int SynchRead = 0;
        internal Exception Error = null;

        public void Complete(Exception e)
        {
            Error = e;
            Complete();
        }

        public void Complete()
        {
            lock (locker)
            {
                if (completed) return;

                completed = true;
                if (handle != null) handle.Set();

                if (Callback != null) Callback.BeginInvoke(this, null, null);
            }
        }

        public object AsyncState
        {
            get { return State; }
        }

        public WaitHandle AsyncWaitHandle
        {
            get
            {
                lock (locker)
                {
                    if (handle == null) handle = new ManualResetEvent(completed);
                }

                return handle;
            }
        }

        public bool CompletedSynchronously
        {
            get { return (SynchRead == Count); }
        }

        public bool IsCompleted
        {
            get
            {
                lock (locker)
                {
                    return completed;
                }
            }
        }

    }

}
